Would be good to add oAuth2 for SMTP on SaaS. As far as I understand currently we can use only basic authentication mail server on SaaS. In many environments IT authorities would prefer to do not leave this exposed.
Microsoft has declared that Basic Authentication will stop working for Exchange Online in 2022.
NOTE: Upon clicking this link 2 tabs may open - please feel free to close the one with a login page. If you only see 1 tab with the login page, please try clicking this link first: Authenticate me! then try the link above again. Ensure pop-up blocker is off.
